🔧 Spark Plugs - Replacement

Your Accord uses a V6 layout with the rear bank tucked under the intake area, so this job takes a little more time than a simple inline engine. The main work is removing the upper intake components, swapping all six plugs, then reassembling everything carefully so there are no vacuum leaks.

Difficulty Level: Intermediate | Estimated Time: 2-3 hours

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⚠️ Safety & Precautions

• Work on a completely cool engine. Hot aluminum threads can be damaged easily.
• Disconnect the negative battery cable before removing intake parts.
• Keep dirt out of the spark plug wells. Debris can fall into the cylinders.
• Use care around ignition coils. Do not pry on the connectors.
• Do not over-tighten spark plugs. The cylinder head threads can be damaged.

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🔧 Required Tools

You'll need the following tools for this repair:

• 8mm socket
• 10mm socket
• 12mm socket
• 14mm socket
• Ratchet
• 3-inch extension
• 6-inch extension
• 10-inch extension
• Swivel socket adapter
• Spark plug socket, 5/8-inch
• Torque wrench
• Trim tool
• Flat-blade screwdriver
• Needle-nose pliers
• Magnetic pickup tool
• Fender cover
• Safety glasses
• Mechanic gloves
• Battery terminal wrench, 10mm

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Spark plugs - Qty: 6
• Upper intake manifold gasket - Qty: 1
• Throttle body gasket - Qty: 1
• Throttle body coolant hose sealing washers - Qty: 2
• Dielectric grease - Qty: 1 tube

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📋 Before You Begin

• Park on level ground and set the parking brake.
• Let the engine cool fully.
• Save radio and clock settings before disconnecting the battery.
• Disconnect the negative battery cable using a 10mm wrench.
• Label connectors as you unplug them.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Disconnect the battery

• Use a 10mm wrench to disconnect the negative battery terminal.
• Move the cable aside so it cannot spring back and touch the post.

Step 2: Remove the engine cover and intake ducting

• Lift off the engine cover by hand.
• Use an 8mm socket and flat-blade screwdriver to loosen the air intake tube clamps.
• Remove the intake duct and air box inlet pieces as needed for access.

Step 3: Remove the throttle body and intake components

• Use a 10mm socket and ratchet with extension to remove the throttle body bolts.
• Unplug the throttle body connector carefully.
• If coolant hoses are attached, clamp them or drain a small amount of coolant first if needed.
• Remove the upper intake manifold fasteners using a 10mm socket and 12mm socket as needed.
• Lift the intake manifold off the engine.
• Keep rags in the intake ports.

Step 4: Access and remove the ignition coils

• Unplug each ignition coil connector one at a time.
• Use a 10mm socket to remove the coil hold-down bolts.
• Twist each coil gently and pull it straight out.

Step 5: Remove the old spark plugs

• Use a 5/8-inch spark plug socket, extension, and ratchet to remove each spark plug.
• Remove one plug at a time so you do not mix anything up.
• Check the old plugs for heavy oil, white deposits, or broken electrodes.

Step 6: Install the new spark plugs

• Make sure each plug gap is correct if the plugs are not pre-gapped.
• Start each plug by hand using the 5/8-inch spark plug socket and extension.
• Torque each spark plug to 18 Nm (13 ft-lbs).
• Hand-start every plug first.

Step 7: Reinstall the ignition coils

• Add a small amount of dielectric grease inside each coil boot.
• Push each coil straight onto its spark plug.
• Install the coil bolts with a 10mm socket.
• Torque the coil bolts to 12 Nm (9 ft-lbs).
• Reconnect all coil connectors.

Step 8: Reinstall the intake manifold and throttle body

• Remove the rags from the intake ports.
• Install the new upper intake manifold gasket.
• Set the intake manifold back in place by hand.
• Use a 10mm socket and 12mm socket to tighten the manifold bolts evenly.
• Torque the intake manifold fasteners to 22 Nm (16 ft-lbs).
• Install the throttle body with the new gasket.
• Torque the throttle body bolts to 10 Nm (7 ft-lbs).

Step 9: Reinstall the air intake parts and battery

• Reconnect the intake tube and tighten the clamps with an 8mm socket or screwdriver.
• Reinstall the engine cover.
• Reconnect the negative battery cable with a 10mm wrench.

Step 10: Start and verify

• Start the engine and let it idle.
• Listen for vacuum leaks or misfires.
• Check that the idle is smooth and no warning lights appear.

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✅ After Repair

• Test drive the vehicle for 10-15 minutes.
• Recheck for loose hoses, connectors, or warning lights.
• If the check engine light was on before, clear codes and confirm they do not return.
• If idle is rough, recheck coil connectors and intake gasket seating.

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💰 DIY vs Shop Cost

Shop Cost: ₹12,000-₹24,000 (parts + labor)

DIY Cost: ₹4,000-₹8,000 (parts only)

You Save: ₹8,000-₹16,000 by doing it yourself!

Shop labor rates vary but typically run ₹1,500-₹3,500/hour. This repair takes a shop approximately 2-3 hours.

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🎯 Ready to get started?

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